there is 3 muk and 5 grimers
a great move for when being in monster houses or bossess where there are more than one is agility it is a great move and would help you alot.
i dont think that piplup or treeko learn agility but other pokemon can
-it raises the speed of every pokemon on your team meening your team will be able to attack more than once in a turn
so if you get a pokemon with agility make it use it twice get loads of reviver seeds and violent seeds this will help alot
im afraid there isnt many moves if any you can use to your advantage but you can use water pulse moves that that that can hit from a distance
i also suggest getting a pokemon that knows a move like discharge that would gradualy take them out a good one that i use occasionaly is vacume cut it does 18 damage to every pokemon in the room appart from your team its good because its a tm and works well with speed boost
you can always keep some pure seeds in your bag to get away easly when on low health
just remember to keep many seeds like violent and revivers seen as your pokemons moves arnt the best
remember agility
hope this helps